Bottom margin guide for typewriting machines



Jan. 25, 1949. KROGSENG 2,459,885

BOTTOM MARGIN GUIDE FOR TYPEWRITING MACHINES Filed Feb. 26; 1946 2 Sheets-Sheet 1 I N V EN TOR. #:265" KROGGENGI Jan; 25, 1949.

H. KROGSENG BOTTOM MARGIN GUIDE FOR TYPEWRITING MACHINES 2 Sheets-Sht 2 Filed Feb. 26, 1946 Hi? 65 KRO 66EA/G Patented Jan. 25, 1949 2,459,&85

BOTTOM MARGIN GUIDE FOR TYPE- WRITING MACHINES Helge Krogseng, Bronxville, N. Y., assignor to Krogseng Laboratories, Inc., New York, N. Y., a corporation of. New York Application February 26, 1946, Serial No. 650,162-

12'Claims. (Cl. 197-189) This invention relates to a bottom margin indicator for typewriters and more particularly to such a device in which an indicating member is arranged to move proportionately to the rotary movement of the typewriter platen and, by such movement, to function inone way or another to warn the operator of the typewriter that the point has been reached where typing on a sheet of paper in the machine should be discontinued to provide a desired margin at the bottom of the sheet.

An important object of the invention is the provision of a margin indicator which may most easily be conditioned by theoperatonwhen a sheet is inserted in the typewriter, so that, without further attention, it will function to signal the completion or approaching completion of typing with in a predetermined bottom margin upon the sheet.

Another obj set is the provision of amargin indicatorwhich, havin once been adjusted to afford a signal for a given bottom margin on a sheet of a given length, need not be readjusted for operation with successive sheets until it is desired to have the device signal a different size bottom margin or to have it function with respect to a sheet of a different length.

Another object is the provision of a margin indicator in which amovable indicating member, at all points in its range of movement, is substantially in the same field of vision with the typeimpact point of the typewriter; so that while an operators vision is focused upon words being typed, the said movable indicating member affords a visual warning of the approaching bottom line of the typed sheet. I

Another object is the provision, in a margin indicator, of a movable indicating member'which, upon reaching a position correlated to a predetermined bottom marginal point of a sheet in the typewriter, automatically becomes reset at a starting position from which it may function with respect to another sheet thereafter to be typed.

Another object is the provision in a margin indicator, of an audible signal arranged to be sounded when the bottom marginal point of a sheet in the typewriter has been reached.

Another object is the provision of a bottom margin indicator which either may he built into a typewriter as an integral part thereof, or may be provided as an accessory which may be easily attached to a typewriter.

stood that this embodiment represents only one of numerous ways and structures in which the present invention may be practiced.

In the drawings:

Figure 1 is a fragmentary perspective view of a typewriter showing the platen thereof and portions adjacent said platen, with a bottom margin indicator, according to the present invention, associated therewith, certain parts being broken way to show the mechanism more-clearly;

Fig. 2 is a vertical section 'substantiallyon the line 2-2 of Fig. 1, showing a movable indicating member carried upon a bail on the typewriter in condition to move in response to turning of the platen to advance a sheet of paper through the machine; v

Fig.- 3 is a front elevational View of the bail, partly cut away to show the said indicating member, in vertical section, in the position and condition which it assumes momentarily at the instant when a bottom margin signal should be given;

Fig. 4 is a cross-sectional view on the lines 4-4 I of Figs. 2 and 3;

Fig. 5 is a fragmentary perspective view of the movable indicatingmember and certain related par Fig. 6 is 'a view, in the same perspective as Fig. 5, of certain portions of the movable indicating member, including a latch which forms a part of said member;

Fig.- 7 is a view, in the same perspective as Figs. 5 and 6, of thesa'id latch and a plunger which, also, forms a part of the movable indicatingmember; and

Fig. '8 is a fragmentary top plan view of one end of the bail, showing, partly in full lines and partly in broken lines, a rod or tongue which functions to operate the mentionedaudible signal.

The present invention, in its entirety, may best be understood from Fig. 1, wherein most of the essential elements and some optional parts of the invention are shown as attached to or incorpo-' rated into a typewriter.

The platen I! of the typewriter is constrained to turn with a spindle I! which extends outwardly from one end of the said platen, through a suitable aperture or bearing in a carriage plate It. The spindle l2 or a similar spindle (not shown) similarly extends outwardly from the opposite end of the platen II through an aperture or bearing in a carriage plate I 4 Thus, the mentioned carriage plates support the platen I I for rotation and carry it axially from right to left under spring tension, in a well understood manner, as charactors are being typed upon a paper sheet positioned upon the said platen.

A. handwheel I5 may be fixed upon the spindle I 2- at one end of th platen- II to facilitate rotation of the latter; and a hand lever I6 maybe provided adjacent the other end of the platen,

and operatively'related to the latter in a Wellknown manner (not shown) to afford means for rotating the platen, after one line of typing has 7 been completed, and for manually moving the platen toward the right, in preparation for the typing of another line. All the foregoing is 'be \vardly beyond the plug 33 to receive the pinion 26 which. is tightly fixed thereon in any suitable manner as by a tight friction'fit, or a key, or by coacting flatson the end portion 36 of the shaft and on the interior of the pinion,'such flats being indicated at'3'l in the drawing. Thus, the shaft lieved to be Well understood by those conversant with typewriters as thus far developed.

The present invention preferably comprises an.

indicating member if, arranged to move longi- I9 is constrained to turn with the pinion 26. The

latter may be held upon the shaft ie by any suitable means, as, for xample by a nut 38.

tudinally with respect to a bail; a'threaded" shaft l9 (Figs. 2, 3, 4, and 5) for imparting such, movement to said indicating member in response i within a cover partially shown at'23 and par tially omitted from the drawing to show the gear train more clearly. The said gear train, or itsmechanical equivalent, maybe of any design suitable for causing the shaft I9 to rotate with the spindle 12. It is shown in the drawings as comprising a primary gear wheel 23 fixed npon' and constrained to rotate with the spindle l2 and having peripheral teeth meshing with an inner toothed portion of a reducing gear wheel 25 having peripheral teeth which, when the bail I8 is in its operative position as shown in full lines in Fig. 1, are in mesh with a pinion 26 fixed upon the near end of the shaft 19, to drive the latter and thus move the indicating member IT.

The ball 58 is carried. upon arms 2'5, 23, which. respectively, are pivoted to the plates l3, l4 at pivot points 29, 30, As the bail 18 must be pivotally raised to its inoperative position, as shown in broken lines in Fig. 1, to insert the'leading'e dge of each new sheet of paper thereunder, the gear cover 23 is left open as at 23a, to permit such pivotal movement of the bail and moreparticularly to permit the pinion 26 to pass into or out of the cover 23 when the bail is so moved.

A bail similar to ball 18 is commonly provided through a suitable hole in said arm and is threaded into'a plug 32 which may be frictionfitted tightly into the end of the ball. The supporting arm 21 for the other end of'thebail '18 may be fixed to the latter by'mean's of a plug 33. tightly friction-fitted into the end of the bail and also into a suitable hole in the arm 21. The plug 33 and the arm 27, preferably, are fixed to the bailonly'after the shaft l9 and related parts are assembled within and on the bail. V

The shaft I9 is rotatably supported at one end, within a suitable axial bore 34 in the inner end of the'plug 32. At its other end the shaft i9 is shouldered as at 35 to form a slightly reduced end portion 36. The shoulder 35 abuts the plug 33, thereby causing the shaft l9 to be held against material axial movement within the bail, and the reduced end portion 36 extends outwardly and rotatably through a suitable bearing aperture in, the plug'33. The end portion 36 extends outi The following description of the indicating member H should be more easily understood if it is observed that at the initial insertion of the sheet in a typewriter, the member I? will be positioned as shown in Fig. 2 and may be manually conditioned to coact with the threaded shaft 19 so that as the platen II is turned to advance the sheet, line by line through the machine, the I shaft l9, through the medium of its threaded portion [9a, will coact with a correspondingly threaded portion of the indicating member H to move the latter toward the right, until the desired bottom line of typing is reached. At that time the member I"! will have reached the trip member 2! which will free theinterengaging threaded portions of the shaft l9 and the member ll, thereby permitting the latte'r to be pulled back to its initial position by a spring 39.

The assembly, hereinbefore characterized as the movable indicating member ll, comprises a sleeve 48 which extends in a close non-binding fit. about the threaded portion Illa. of the shaft l9. -Upon the top of the sleeve 40 is mounted a block 4|, which as best seen'inFigs. 2-4, extends through an elongate slot I821 in the bail and has wings 42 formed thereon, extending outwardly and downwardly about the exterior of the bail. A slight sliding clearance is provided between the block 4| and'the slot la and the exterior surface of the ball.

A cap 43 overlies the block 4!; and the sleeve 49, the block 4|, and the cap 43 are rigidly fastened together by small screw bolts 44, 45, having nuts 46, 4! upon their outerends. The bolts 44,

45 have flared flat heads which are seated within slots 460., 401) in the top of the sleeve 4!]. The said slots facilitate assembly of. the device, slots 48a having an open-end and slot 4317 having an enlarged portion 400, to permit the insertion of V the said bolts in the mentioned slots.

The indicating 'member I! also includes a plunger 48 which extends vertically through suitable openings in the cap 43, the block 4!, and the sleeve 48, and has a preferably partial-cylindrical concave surface 49 at its lower end, which is grooved or threaded to enable it to mesh with the threaded portion I911 of the shaft 19, as may best be understood from Fig. 3. The plunger 48 is urged upwardly by a'compression coil spring Eli, which extends around the upper end of said plunger and is interposed between the .cap 43 and a button or head 5| fixed upon or integral with the upper end of the plunger 48.

A U-shaped latch 52 serves to limit the upward movement of the plunger 48 and also to hold the latter in its lowermost position. The latch 52, best visualized in its entirety in Figs. 6 and 7, has one arm 53, which is hereinafter sometimes referred to as a latch-arm, a second arm 54', which is hereinafter sometimes referred to as a trip-arm, and a base portion 55. The latch 52 is. urged toward the right by a short, compression, coil-spring 56 which is interposed between the block 4] and the trip-arm 54, being held in that position by a short stud 5'! which is fixed into the arm 54 and extends axially within several coils of the said spring. The stud 51, however, is short enough to avoid interfering with the intended limits of movement of the latch 52.

ing member l1) between a leftward position of the latch in which the latch arm 53 seats within a shallow lateral rabbet 59 in the plunger 48, as shown in Fig. 3, to limit the upward movement of said plunger, and a rightward position of the latch in which the latch arm 53 seats within a deeper lateral rabbet or groove 60 in the plunger 48, immediately adjacent and communicating with the rabbet 59, to hold the plunger 48 in it lowermost position, as shown in Fig. 2.

It may be understood that, if the plunger 48 is in its uppermost position, as shown in Fig. 3, and is manually pressed downwardly to its lowermost position upon the initial insertion of a sheet in the machine, the downward movement of the plunger brings the groove 50 into horizontal register with the latch-arm 53 whereupon the latter automatically moves toward the right into the groove 60 in response to the force of the spring 56, whereby the plunger is held in its lowermost position, as, shown in Fig. 2, with its lower end in mesh with the threaded portion Isa of the shaft [9. In this condition, the indicating member l1 threads its way along the threaded portion We of the shaft I9, as the latter turns in response to rotation of the platen H to advance the sheet through the machine.

If, then, the latch 52 is moved to the left within the transverse recess 58 when the desired bottom line of typing has been reached or completed, the plunger 48 becomes free to move back to its uppermost position in response to the force of the spring 58 and the indicating member l1 becomes freed of coaction with the threaded portion 19a, and is instantly pulled back to its initial position by the spring 39. In the present invention, the.

last mentioned movement of the latch 52 is accomplished automatically, when the last desired typing line on a sheet is reached or completed,

by means hereinafter described. 7 I

The movable indicating member I! is shown in Fig. 2 in its initial position corresponding to the initial position of a sheet of paper in the typewriter. The member I! is yieldably heldin that position as shown in Fig. 2, the spring 89 is in its free or unloaded condition. The characteristics of the spring 39 are such that in the operation of the device, the said spring does not acquire a set which could either elongate or shorten the normal length of the spring, therefore the initial position of the indicating member I! is always as shown in Fig. 2.

The trip member 2| is provided as a means which, when the desired bottom line of typing has been completed, serves to move the U-shaped latch 52toward the left relatively tothe block 4! within which it is mounted. Actually, in operation the trip member 2! serves to arrest the rightward movement of the latch 52 by engaging the trip arm 54 of the latch, as the indicating member ll threads its way toward the right along the screw portion l9a of the shaft IS in response to rotation of said shaft as the platen I is turned to advance a sheet through the machine, the remainder of the indicating member, meanwhile, continuing to move rightwardly to an extent sufficient to cause the latch-arm '53 to move out of the groove 68 in the plunger 48. This permits the plunger 48 to rise and become disengaged from the threaded portion I9a of the shaft l9 so that the indicating member may be pulled back to its initial position by the spring 38 in readiness to function with respect to the next sheet to be inserted in the machine.

The trip member 2|, as shown in Figs. 2 and 3, may comprise an interior friction plate 6| which is somewhat wider than the slot I811 and disposed in sliding contact with the interior surface of the bail IS, a stem 62 integral with or fixed to .said plate and extending upwardly through said slot, a head 63 integral with or fixed upon the upper end of the stem 62, an exterior friction plate 64, somewhat wider than the tion at which it may coact with the latch 52 to cause the automatic return of the indicating member llwhen the last desired line of typing has been reached or completed.

The bail l8 may be provided with markings 65, and the exterior plate 64 of the trip member 2| may be formed with a pointer 81 to aid an operposition by the coil-spring Sit-which extends about the shaft i9, suitably anchored at its opposite ends to the plug 32 and the sleeve 48. -These anchorages, for example, may be similanand may be effected by having several end coils of the spring 39 extend tightly about reduced extensions 6! and 62, provided respectively on theopposed ends of the plug 32 and the sleeve 40 as best illustrated in Fig. 2. Although not shown in the drawing, the anchorage of the end coils of the spring 39 and the extensions El and 52 may be made more secure either by providing, on thoseextensions, threads or grooves into whichthe' ator in achieving accuracy of positioning of the said trip member to cause the latter to coact with the-indicating member I! to signal, at the desired time; the approach to or completion of the desired-last lineof typing.

.Obviously, an operator will quickly learn the proper setting of the trip member to signal a desired margin on a sheet of a certain length. For example, the operator may learn that, if the pointer 51 is set at the marking bearing the number 5, the signal will occur upon reaching a point about two inches from the bottom of a sheet which is, 11 inches in length or that for a sheet of the same length, the pointer 5'! may be set at thatpointer-settings at 10, or 15, or 20, may cor- 4 numbers 10 or 15, respectively, to signal bottom margins of 1 inches or 1 inch. If a sheet 13 inches long is being used the operator may learn respond substantially to bottom margins of 2 1 inches, 1 inches, or 1 inch. After a short period of usage the operator will know at what ongoose-s.

position to setritheu ri. member:212th caus'ei'fa signaltmapproxirnatelz; t' fdesiredo distance fromfthefbottom of a sheeto'i anyl'size commonl used s: H s

No attempt has oeenimade in the drawings to '15 indics ei'precisel gear and zthreacl ratiosi :Obvi ously, such ratios canw'oe .arrived' 'avby 'simplef computations to assure satisfactory movement of theinclicating member 1?; a

Although the automatic leftward movement oj 510 the'indicating member ii, at the clesired'ipreda termine'cl last linear typing, may serve as ania'dee: qua'tesignal, and for that reason, the invention; a as thus'far detailed may he-considered complete ly operative, nevertheiess, it may be 'p'referredwto have a clearly audible signs? Thereforepl illllE- trate a beil and a bell operating arrangement which may advantageously beernploye d.

The bell'or gong 22 may be fixed. in 'anysuit-W able manner as by-a bracket a'ifi festenedtothe' rear of a paper support which travels with the platen-Li i. A; lever it having a clapper?! oh one: endthereof, adjacent the beil 22, maybe pivoted" J to the bailarrn 2 3 at '52 to turn substantially h'ori zontally about a vertical axis; and the otherrend 25 of'the lever it may have: a vertical extension lii; extending downwardly through a short slot =14 in g the tenor the bail i8, thence into an aperture 'iavin one" end- 75 of a preferably'fiatkrod' l6 which extends Within the bail 58, in a position" overlying the spring 38,'and.h'as an offset 'tlatr its other'end; extending outwardly through-the slot" Eta terminating in an impact headllii'which'"? is adapted-to be struck momentarily by' the block- 45 of theinclicating member 5?! "whenrthe' latteris pulled sharply to the leftbythe; spring 39 at the desired signal time.

The rnain or central portionoi the rod 75 may? be. longitudinally ridged or may be curvedlaterally somewhat to'enhance its strength. The' end-qu of th' rod worlc; Within a chordalrspace- 19 provicleclJ-ibye flat at 'forrnelton the'top of thev plug 32 and Wings 'ifia-(Figsfi and 8) on thei im ipact head it, support the other enclof the rod. 1

The mentioned impact of the block M upon" the head 13 causes-the lever'lfi to rotate-clock; Wisely, "as vieweclin Fig. l, bringing't'he "clapper 1! into sharp impact with the bell-'22 to 'ringt'thefi latter.i "Thisi'impact is only momentary because the lever it! is normally held, with its clapperfl L out of contact with the'ibel lgiby"av smalhtensioh coil-spring 5i, connecterLat-its encla'it'o the-' baili. arm 223 and the lever 79'. In order to strike therorl "6 to soundthe belli'i i moveni out at the desired signal tim ftward movement causes a momentai com ression of thespring 39 whichcauses thm indicating member ill to return to its initialno; sitiou immediately upon sounding the bell 1 Although the foregoing description should give an understanding of the operation of the. inve'n' tion, it may be made clearer by the following recital of a complete cycle of 'operation which stresses the sequence ratherthanthe detail's oi operation; 1

Let it be assumed that the operator-{intending to type" on a sheet, 11 inchesin length,"kno'v'vs w thata desired margin will be signaledif the trir'r' 1 member 25 is set at number '5 on thebail mark ings- 56. He so setsthe trip niemberf -then in-.1 sorts. the sheet into the machine; tur nin'gkthe handwh'eelllfi for this purpose. -:'He thenlifts the= spring .39 i.

heating-member 7:? moves leftwarclly, :be-

bailazla'ff passesi zth''.leading' 'edget of tth'e "sheet thereunde tand thenwlowers tiexbail."Thenhei" aligns the isheet' by "seeing that .its upper I edge I is just barely visiblerabovathe bail andz'is substantiaily parallel -thereto.- Without "regard to the present:inventiong this procedure is custom aryin thetuse of any=typewriter having a'bail.

Tire-"operator,"them'merely presses the plunger 48 downK(it 'having theretofore been in its upperproportionate-turning "of the shaft i5'2;nd1'ighti-' war'ctrnovementiof the indicating member l'l.

Wli'err t the? "paper-has "advah so: through typewriter "6018; point just befor engagesieth trip :member '2 i thereby preventing fuiith r r Upon furtherr'rotationrof the'platen ll to our the *sheetrinto positionrfor the last line of typing or to carry' 'theshee i-beyon'd? that position, (the remainder-of th'ez indicating member l1'moves'* further? to theriglit oausing the latch '52 to :re-

lease ithe plunger it tobring the'latter and other parts -0 their positions shown in Fig.3, particu: .Jarlyto' 'unme'sh the' said "plunger and the threaded'portion lsQa of the shaft 19.

Inthis condition the indicating member H "is pullecl=sharply ito the lef tj its inertia'causes it to strike?the' ='r )dr l6 to-s'ouncl the bell; and'then the assumes its-unloaded condition With the -indi'cating member llon itsfinitiai Position in reacliness -torunctionwith respect to thenextsheet irrs'erte'd: in th'e'ftypewriter. As long a the operator -cont inues =to'-use the same sheets and desires the same bottom rnargin, the'trin member 2Hfine ezi-Fnot bereadjusted;- The trip memb'er nee only be reatijusted When a cliffer entisize 'shee is to b'eueeclor a different size bottom merrg-in"is desired;

fi The present "-invention' permits turning the platen forwar d to effect a correction and,-then, turning it back to'resul'ne'typing; Inthis, however; the 'operator' -will xercise'a little careto assure that wheneverthe platen is being'tu'rned either directio'nJthe bail will b'e'in its normal position 'u liththe pinion 25 in mesh with the gear whel -fifias otherwise the necessary relationship betweenthe movements of the platen and the indicatingmember would'bedestroyed. This re- 7 "iiuiremerit= of -the operator, however, is not a drawbackf'o r'it is a matter of habit for the OFF scribed herein is simple, effective both visual y andaudibl'yi easy of operation,"useful either as an accessory orasabuilt-jn part of a typewriter; and, generally, -yields"" all thevarious objects and eidvalntage's'hereinbefore ascribed thereto. Also;

the last desireit -line' of typing: the I latch? arm" 54 or the 1atc1ri52 ,,htrvarcl'fmovement of the latch 5.2;

it should be obvious that the device, particularly the gear and'threaded shaft portions thereof,

may be designed for any given diameter of platen and that various other structural embodiments and modifications may be employed without departing from the invention as defined in the following claims.

What I claim is:

. 1. A bottom margin indicator fora typewriter having a horizontally disposed platen for supporting a sheet and for moving it through the typewriter; the said indicator comprising an indicating member supported for movement along a linear course; a screw, coacting with said platen and said indicating member for moving the latter along said course in direct proportion to the movement of the sheet through the typewriter; means independent of said sheet for interconnecting said screw and said member, to condition the latter for movement in one direction'along said course in response to advancing movement of the sheet through the typewriter; means independent of said sheet for automatically disconnecting said member and said screw upon such advancement of the sheet to a predetermined extent through the typewriter; and means, operative upon such disconnection, for moving said member in the opposite direction.

2. A bottom margin indicator for a typewriter having a horizontally disposed platen for supporting a sheet and for moving it through the typewriter; the said indicator comprising a retatable, threaded shaft; means for rotating said shaft in direct proportion to the movement of the sheet through the typewriter; an indicating momber, adapted to coact with a threaded portion of said shaft, whereby to be moved proportionately to such movement of the sheet; manually operable means independent of said sheet for establishing such coaction; and means, independent of? said sheet and operative upon said indicating member reaching a predetermined position in its mentioned movement, for automatically disestablishing such coaction.

3, A bottom margin indicator for a typewriter having a rotatable cylindrical platen for advancing a sheet through the typewriter and a bail adjacent to and parallel to said platen and adapted to engage such a sheet to maintain the latter in intimate association with said platen; the said indicator comprising an indicating member, support-ed upon and movable along said bail; normally non-operative transmission means adapted for change to operative condition to establish a transmission. connection between said platen and indicating member to impart such movement to the latter in direct proportion to rotative movement of said platen; means for automatically disestablishing such a connection in response to movement of said indicating member to a predetermined extent following the establishment of such a connection; and means, operative automatically upon such disestablishment of such connection, for signaling the completion of the predetermined movement of the indicating memher.

4. A. bottom margin indicator for a typewriter having rotatable cylindrical platen for sup porting and advancing a sheet through the typewriter and a bail adjacent :to and parallel to said platen; the said indicator comprising a threaded shaft having common support with said bail; actuating means for rotating said shaft in. direct proportion to the rotation of the'plate'n; an indicating member coacting with said bail for restraining said indicating member against rotation relatively to the axis of said shaft and having a shaft-engaging portion which is releasably engageable with respect to a threaded portion of said shaft; manually operable means for interengaging said threaded portion of said shaft with said threaded portion of said shaft; means,

operative upon such release, for moving the said dndic-ting member automatically in the opposite direction; and signal means operative in response to the latter movement.

bottom'margi'n indicator for a typewriter having a horizontally disposed, rotatable, cylin drical platen for supporting a sheet and for advancing it through the typewriter; the said indicator comprising a-tubular bail member extendadiacent and parallel to said platen and having a substantially straight longitudinally extending slot therein; a threaded shaft rotatably supported within said bail member; an indicating member supported upon and adapted to move along said bail member and having a portion extending through said slot and coacting with the walls of the bail member defining said slot for restraining said indicating member against rotation; means for rotating said shaft in direct proportion to rotation of said platen; nonrotatable means coacting with and operatively intel-connecting said indicating member and a threaded portion of said'shaft whereby to thread said indicating member in one direction along said shaft when the latter is rotated; automatic means for breaking such interconnection at a predetermined point in the mentioned movement of the indicating member along said shaft; and means operative upon the breaking of such interconnection for moving said member in the opposite direction.

6. A bottom margin indicator for a typewriter having sheet-actuating means for moving a sheet therethrough; the said indicator comprising a threaded shaft; means for rotating said shaft in direct proportion to such movement of the sheet; an indicating member supported for rectilinear movement along said shaft; yieldable means for holding said indicating member normally in a first position; means independent of said sheet for intermeshing said shaft and a portion of said indicating member to render the latter movable along said shaft to a second position in response to rotation of the latter; and means operative upon said indicating member reaching said secend position for automatically unmeshing said shaft and said indicating member to render the latter movable from such a second position to said first position.

' "7. A bottom margin indicator for a typewriter having sheet actuating means for moving a sheet therethrough; the said indicator comprising a threaded shaft; means for rotating said shaft in o-ppbsite directions in direct proportion to such movement of the sheet in opposite directions; an indicating member guided for movement along a course adjacent to and parallel to said shaft; a spring fixed toand normally holding said indicating member in a first position on said course;

dicating member and is manually movable from determined second position of said indicating member to break such meshing engagement, thereby permitting the said indicating member to return to itssaid first positionin response to the force of said spring. 1 a V V 8. A bottom margin indicator for a typewriter according to claim '7, further characterized in,

having an audible signal element, and means operative in response to such return movement of said indicating member, forsounding said signal element. V

9. A bottom margin indicator for a typewriter having sheet actuating means for moving a sheet,

view of an operator a spring fixed'to and nor-' mally holding said indicating member in a first position on said course; a connecting element which is associated with said indicating member and is manually movable from an inactive position, clear of said shaft, into intermeshing position, in meshing engagement with the latter to render'the indicating member movable, against the force of said spring, from said first position to a second position; and tripping means adapted to coact with said indicating'member at a predetermined second position to'break such meshing engagement, thereby permitting the said indicating member to move back to its said first position; further characterized in that thesaid shaft has an unthreaded portion of reduced diameter to limit the coaction of said shaft and indicating member for moving the latter in a direction, from said first position, opposite to --movement to such a second position.

10. A bottom margin indicator for a typewriter having ahorizontally disposed rotatable cylindrical platen for supporting aisheet and for moving it through the typewriter, anda tubular bail disposed in front of and parallel tosaid platen; said indicator comprising a rotatable threaded shaft within said bail; motion-transmitting means "between said platenandshaft for rotating the latter proportionately to rotation "of said platen; an indicating member, mounted upon said bail for movement longitudinally of the latter along'a slot provided in said bail and having an-element extending through said slot and being manually movable into meshing engagement with said .shaft to condition the saidindicating member for movement'along the shaft, from a first to a second position, in response to rotation-of said shaft,

and also having means normally urging said element from such meshing engagement, and a resuch meshing engagement; and an audible signal having operating means disposed in position for actuation by said indicating member upon moveoi the latter, impelled by said spring means,

7 fro a said second position, to and beyond said first posi ion; the said spring means, also, being adapted to cushion the termination of such impelled movement or" the indicating member. 7

' iL In a bottom margin indicator for a typewriter having a longitudinally slotted tubular bail and'a threaded shaft therein, rotatable indirect proportionto movement of a sheet in either of opposite directions through the'typewriter; an indicating member having guide portions, in close sliding relation to portions of said bail adjacent to said slot, iorguiding the said indicating membar for longitudinal movement along the bail while preventing material movement or" said 7 member laterally and angularly; a shaft-engagmg element having a foot adapted to intermesh with a threaded portion'of said shaft, and means "for yieldably hciding the said element clear of eating member against any material movement such intermeshing with said shaft, said shaft engaging element being movable manually to bring said foot into such intermeshing position;

and aiatch having a portion adapted to engage a portion of'said shaft-engaging element to hold the latter in said interineshing position; the said latch being adapted for disengagement from said shaft-engaging element whereby to release'the latter frorn'its said intermeshing position.

12. In a bottom margin indicator for a typewriter having a tubular bail'with a longitudinal slot and threaded shaft in said bail, which shaft rotatable proportionately to opposite movements or" asheet in the typewriter; .a movable indicating member having a shaft-guided. portion and a beiihguidedportio-n extending within said slot, which portions'respectively coast with said shaft and the said slot to'restrict the said indiexcepting movement longitudinally of the bail; a manually'depressible plunger associated with said indicating member and having a foot'adapted to :intermesh with said shaft; spring means normaily holding said plunger against such intermeshing; a latch carried by said indicating memher and capable of limited movement relatively to said plunger; and a spring normally urging said .iatch'into latching engagement with said plunger to hold the latter in its mentioned interi meshinglposition; the said latch having a portion at the exterior of the said indicating member for actuation of said-latch to release it from latching engagement with the said plunger.

HELGE KROGSENG.

n imnsrions crrEn The following references are of record in the file of this patent:

UNITED STATES PATENTS Number 7 Germany 1929 

